libvirt NSS util/virlog.c access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in libvirt. This affects an unknown function of the file util/virlog.c of the component NSS Module Handler. The manipulation results in access control. This vulnerability was named CVE-2018-6764. The attack needs to be approached locally. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in libvirt (Virtualization Software) (unknown version). It has been classified as critical. Affected is an unknown code block of the file util/virlog.c of the component NSS Module Handler. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

util/virlog.c in libvirt does not properly determine the hostname on LXC container startup, which allows local guest OS users to bypass an intended container protection mechanism and execute arbitrary commands via a crafted NSS module.

The bug was discovered 02/05/2018. The weakness was presented 02/23/2018 by Jann Horn (Mike) with Google Project Zero (Website). The advisory is shared for download at redhat.com. This vulnerability is traded as CVE-2018-6764 since 02/06/2018. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability was handled as a non-public zero-day exploit for at least 15 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 106928 (Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : libvirt vulnerabilities (USN-3576-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277201 (Fedora Security Update for libvirt (FEDORA-2018-b22d46eabb)).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (106928) and SecurityFocus (BID 102376†). See VDB-112184, VDB-112440, VDB-115193 and VDB-137899 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 106928
Nessus Name: Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : libvirt vulnerabilities (USN-3576-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 841645
OpenVAS Name: Ubuntu Update for libvirt USN-3576-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/03/2018 🔍
02/05/2018 +33 days 🔍
02/06/2018 +1 days 🔍
02/20/2018 +14 days 🔍
02/21/2018 +1 days 🔍
02/23/2018 +2 days 🔍
02/23/2018 +0 days 🔍
02/24/2018 +1 days 🔍
02/08/2023 +1810 days 🔍

Sourcesinfo

Advisory: USN-3576-1
Researcher: Jann Horn (Mike)
Organization: Google Project Zero
Status: Confirmed

CVE: CVE-2018-6764 (🔍)
GCVE (CVE): GCVE-0-2018-6764
GCVE (VulDB): GCVE-100-113748

OVAL: 🔍

SecurityFocus: 102376 - Multiple CPU Hardware CVE-2017-5715 Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 02/24/2018 09:32
Updated: 02/08/2023 18:55
Changes: 02/24/2018 09:32 (73), 01/08/2020 09:26 (8), 02/08/2023 18:49 (4), 02/08/2023 18:55 (1)
Complete: 🔍
Cache ID: 216::103

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